|
|
|
|
| Author |
|
|
Registered
Join Date: May 2005
Location: Tucson
Posts: 203
|
annoying engine vibration
My 88 924s has had an engine vibration at two points- 1200-1400 rpm (minor) and 3000-3200 rpm (major) for several months now. The car wasn't running for a year before this and I can't remember it vibrating before that.
The balance shafts are on time for sure, and I just replaced motor mounts which smoothed out the whole rpm range, but did nothing to help the problem spots. It happens with the clutch engaged or disengaged, and I had a friend hold his hand behind the muffler and feel for a miss, but the exhaust pulses feel quite smooth. Does anyone have an idea of what this could be? Possibly a damaged balance shaft? Thanks for you input 
__________________
-Gabe -black 1988 924s, 944 turbo sway bars, LSD, gunmetal phone dials-- SOLD to some people who cannibalized her -1987 MR2 ---ONLINE REP FOR RADMACHER PORSCHE SERVICE IN TUCSON--- |
||
04-23-2007, 03:38 PM
|
|
|
Registered
|
Your balance shaft pulleys are on wrong. It's the only thing that will cause these vibrations.
__________________
Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! Last edited by SoCal Driver; 04-23-2007 at 10:35 PM.. |
||
|
04-23-2007, 06:51 PM
|
|
|
Redline Racer
Join Date: Jan 2007
Posts: 2,444
|
Here's the clark's garage proceedure for checking that.
http://www.clarks-garage.com/shop-manual/eng-08.htm
__________________
1987 silver 924S made it to 225k mi! Sent to the big garage in the sky |
||
|
04-23-2007, 07:34 PM
|
|
|
Registered
Join Date: May 2005
Location: Tucson
Posts: 203
|
I will have to check again. Thanks as always socal.
__________________
-Gabe -black 1988 924s, 944 turbo sway bars, LSD, gunmetal phone dials-- SOLD to some people who cannibalized her -1987 MR2 ---ONLINE REP FOR RADMACHER PORSCHE SERVICE IN TUCSON--- |
||
|
04-23-2007, 07:38 PM
|
|
|
Registered
|
Use a piece of wire to probe for the key in the key way. Even if the O and U are in the correct orientation the key ways can be off a half turn.
__________________
Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
||
|
04-23-2007, 10:35 PM
|
|
1983 Porsche 944 2.5 liter
